Mixed infection of CTV and HSVd in yellow corky vein disease of Washington navel orange trees

Hop stunt viroid (HSVd) and Citrus tristeza virus (CTV) are the causal agents of most important diseases of citrus. Previously we reported a novel variant of HSVd that constantly associated with the yellow corky vein disease. Here, 19 individual citrus leaves with yellow corky vein symptoms were sampled for CTV by ELISA. In this study, most symptomatic samples were found to be infected with CTV. Therefore mixed infection of CTV and HSVd may be, involve in appearance of yellow corky vein symptom in mentioned disease.